Competition Electronics Digital Chronograph offers accurate velocity measurement for rifles, pistols, arrows and shot guns. Easy to Set Up And Use. The Webs best price and Free Shipping! Accurate velocity measurement for rifles, pistols, arrows and shotguns. Easy to set-up and use with a HUGE shooting area. Store 9 shot strings with up to 99 shots per string in power down memory. Review through each velocity and shot data including standard deviation, extreme spread and average velocity. Optional indoor light kit required for indoor use. Durable plastic light diffusers are included.